tomsrtbt is the most Linux on one floppy disk for rescue recovery panic and emergencies, contains tools to keep in your shirt pockets, is useful whenever you can't use a hard drive and contains about 100 rescue tools.

waitfordevice is a tool that waits for a device to
become available. One can use this, for example,
when waiting for a USB device to be fully ready
after modprobing the USB subsystem (which runs
async). This tool can be used in startup scripts
or other scripts that need to use a device. It is
better guaranteed to work (and more efficient)
than using a couple of sleep statements.

xml-HTB is a tool for automatic generation of bash
scripts that sets up HTB on Linux. It uses XML
configuration files. It's easy to use, and
features multiple depths of classes, configurable
leaf, u32 and fw filters, and the ability to
configure both the input and output interfaces at
the same time.